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CEL, 'system too rich (bank 1) 850

posted by  HD on  Mon Dec 26 04:50 CST 2005
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last visit: Sun Jan 15 12:09 CST 2012
[RELATED]

Morning Guys and Gals:

CEL came on last night coming home from my sons house. Got the scanner out this a.m. and pulled off the code that read: "system too rich (bank 1)". Can anybody tell me what causes this. I came back from Alabama last Monday and I did notice that my mileage had fallen off from 30 to about 26. Now that the light came on last night it makes sense about the mileage drop off. Runs smooth but I can definitely smell that raw gas smell out the exhaust.

Any help with the cause would certainly be appreciated.

Thanks in advance to all!!

Henry

97-850/101k, 98-S70/95k

before: 82-260GLE(total crap), 84-240GL, 85-740GLE, 91-740, 92-940GL. All with TONS of miles on them. The 92-940 was the BEST one of them all!! Should have never sold it to my brother.








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    CEL, 'system too rich (bank 1) 850

    posted by  someone claiming to be ksg on  Tue Dec 27 06:09 CST 2005 [RELATED]

    If there are no other codes such as an oxygen sensor code set, your fuel pressure may be too high (defective regulator).

    Or, the engine coolant temp (ECT) sensor may be out of range (not usual though - usually it would either work ok or not at all). If ECT is not working at all (open or short circuit) you should get a code for that, and I would expect the car to run poorly.

    You might not get an oxygen sensor code, in case the oxygen sensor is really working ok but just trying hard toward getting the mixture back in line.

    Does your engine come up to temperature (i.e. do you get good heat in the car) and does the dash temp gauge read properly? This applies especially to highway driving. If engine is running too cold for longer than the normal warmup period - bad or sluggish thermostat?








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    CEL, 'system too rich (bank 1) 850

    posted by  MadeInJapan on  Mon Dec 26 06:40 CST 2005
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    last visit: Sat Oct 2 06:34 CST 2010
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    Usually, Bank 1 too rich is for the front Oxygen Sensor going out. Hope this helps. Good luck.
    --
    1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.







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